/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
	This file is part of foam-extend.

	foam-extend is free software: you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by the
	Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	foam-extend is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

Description
	Starts timing CPU usage and return elapsed time from start.

\*---------------------------------------------------------------------------*/

#include "cpuTime.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //

void cpuTime::getTime(std::clock_t& t)
{
	t = std::clock();
}


double cpuTime::timeDifference
(
	const std::clock_t& start,
	const std::clock_t& end
)
{
	const double difference = std::difftime(end, start) / CLOCKS_PER_SEC;
	return difference;
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

cpuTime::cpuTime()
{
	getTime(startTime_);
	lastTime_ = startTime_;
	newTime_ = startTime_;
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

double cpuTime::elapsedCpuTime() const
{
	getTime(newTime_);
	return timeDifference(startTime_, newTime_);
}


double cpuTime::cpuTimeIncrement() const
{
	lastTime_ = newTime_;
	getTime(newTime_);
	return timeDifference(lastTime_, newTime_);
}


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// ************************************************************************* //
